LinkedIn is one of the social networks like Facebook, Twitter, and others, but LinkedIn appears slightly different from most social networks.
LinkedIn is more for professionals. It is used to "sell yourself online", but professionally. The meaning of "selling yourself" written here is, of course, to sell your time and abilities or in other words looking for a job.
The most interesting thing about this social media is that the executives from all Fortune 500 companies are in it, and many even use LinkedIn to recruit employees to be employed in their companies. That is why LinkedIn is one of the best ways for you to be spotted by these great companies.
You only have to make sure you write a great resume to win their attention. So be wise, do some research, write a killer resume and who knows luck will be on your side - one day you are just an employee in a small company, the next day you are working in one of those giant company! thanks to Linkedin!